best available copy



Sept. 15, 1925. 1,553,555,

A. H. ROBINSON FLUE CHECK DAMPER AND CLEAN-OUT Original Filed July 23, 1

I Snow",

Patented Sept. 15, 1925.

UNETE ARTHUR H, ROBINSON, DFLAKEWOOD, OHIO.

FLUE CHECK DAMYER AND CLEAN-OUT.

Ap lication filed July 23, 1924, Serial No. 727,568. Renewed June 8, 1925.

To all whom may concern:

Be it known that I, ARTHUR H. ROBINSON, a citizen of the United States, residing at Lakewood, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Flue Check Dampers and Clean-Outs, of which the following is a specification.

lily invention relates to improvements in check dampers and clean-out structuresfor fines, the present embodiment of the invention being particularly designed and adapted for use in connection with ordinary hot air furnaces.

The primary object of the invention is to provide a generally improved structure ,of the character described which will not only be simple in construction, but by reason of improved check damper and clean-out features adapted to meet the varying exigencies of actual service will be particularly eflicient in use.

A furtherand important object, is to improve the construction and relative arrangement of the clean-out and check doors and particularly the draught or fresh air inlet leading from the latter a when partially opened including an improved form and arrangement of check damper carrying extension or casing, the. relative arrangement and disposition of the parts bein such that the fresh air entering through thecheck damper opening will enter directly beneath and be sucked up into the main flue of the horizontal stub pipe very gradually and without radically disturbing the draught or con b istion in the fire-box and combustion chamber of the furnace.

' A still further object is the provision of an improved check damper carrying extension or casino? with an improved detachable door frame for the clean-out and check doors and improved means for connecting such casing and door frame members to each other and to the horizontal stub-nine of the furnace or smoke flue.

\Vith the above mentioned and other ends in view, the invention consists in the novel construction, arrangement and combination of parts, hereinafter described, illustrated in one of its embodiments in the accompanying drawings, and particularly pointed out in the appended claims.

Referring to the drawings, forming a part of this specification, Figure l is a side elevation of an ordinary hot air furnace casing, equipped with a check damper and clean-out structure, constructed in ac cordance with this invention.

Fig. 2,,a front elevation of the door frame and attachedrlean-out and check doors, detached.

Fig. 3, an enlarged central vertical sec tional view of the improved structure in attached assembled relation to the flue structure.

Similar numerals of reference designate like parts throughout all the figures of the drawings.

The furnace structure, proper, may be of any suitable and convenient form or type and so likewise with respect to thefurnace casing 1. In the present instance, I have shown my improvements applied to an ordinary hot air furnace casing of conventional ,form including a stub-pipe 2, having an upwa'rdly extending branch 2*, at its top and forming apart of the main fine 2", leading to the chimney.

The stub-pipe2 is provided with an opening 2 in its bottom directly below or diametrically opposite the opening of the branch or main flue.

" Asa means of properly directing and regulating the fresh air enteringfrom the check damper door, hereinafter referred to, and with respect to the superposed or main flue, a check damper carrying extension or casing 3, is, provided, said branch" extension orlcasing preferably extending downwardly and forwardly from the opening 2 and terminating at its, front or mouth in a down wardly and outwardly inclined marginal portion 3 and preferably projecting beyond the front end or clean-out door portion o the stub-pipe 2.

The casing. 3 is preferably formed with a curved base 3, adapted to be secured to the lower portion of the stub-pipe 2 in suit able and convenie'nt manner, as for example, by means of suitable fastening elements or screw bolts 3 extending through the marginal portions thereof, as shown.

As a means of securing the clean-out and check damper doors in proper relative posii tion to each other, as well as to th extension casing 3 and the front or open end portion of the stub-pipe 2, a door frame is provided, said door frame preferably comprising a circular shaped upper portion 4, having an inwardly flanged ring portion 4*, adapted to extend within. and. be secured to the marginal front edge of the stub-pipe and a rectangular shaped forwardly and downwardly inclined door or frame section 4 resting upon the marginal edge of the similarly inclined front edge of the branch extension or casing 3. The opening in the lower door frame section 4 may be surrounded by a marginal flange 4 as shown most clearly in Fig. 3 of the drawings.

The clean-out door 5 is carried by the upper portion of the door carrying frame and is adapted to swing horizontally by means of the hinged members 5 at the side and the check damper door 6 is adapted to swing vertically through the medium of the hinge members 6 suitably attached to the lower member of the frame, a laterally projecting lug 6 being provided, in the present instance, for convenient attachment to a check damper operating chain or cord in a well known and understood manner. The check damper 6 may be provided on its under side with a marginal flange 6, adapted to receive and take over the marginal flange 4 of the door section 4 as shown most clearly in Fig. 3 of the drawings. The sides of the door carrying frame are preferably provided with rearwardly extending attaching lugs 4 adapted to receive and extend over the outer sides of the extension casing 3 and to be detachably secu'red thereto by means of attaching bolts and nuts 4 and the flanged ring portion 4 may be secured within the openend of the stub-pipe 2 by means of attaching elements or bolts 4 Having thus described one of the embodiments of my invention, without having attempted to set forth all the forms in which it may be made, or all the modes of its use, what I claim and desire to secure by Letters Patent is,

1. In a structure of the character described, including an open end pipe section, an off-set check damper section carried thereby and provided with doors affording access to said pipe and damper sections, respectively. V

2. In a structure of the character de scribed, a horizontal stub pipe including an upwardly extending main flue, a check damper extension off-set below said stub pipe and main flue, and a check damper door normally closing said check damper extension.

3. In a structure of the character described, including a superposed pipe section, a check damper casing provided with a curved base to receive said pipe section, and a clean-out and check damper carrying section detachably connected to the front portion of said casing and the front end of said superposed pipe section.

4. In a structure of the character described, a horizontal open end pipe section having diametrically opposite upper and lower openings, a check damper carrying section beneath said open end pipe section and communicating with said lower opening, and a door frame connected to said check damper section and provided with clean-out and check doors.

5. In a furnace flue clean-out and check damper, a horizontal stub-pipe carrying a superposed main flue and having a subjacent opening opposite said main flue, a forwardly extending branch housing on said stub-pipe communicating with said opening, and a door frame carrying clean-out and check damper doors covering the front ends of said stub-pipe and branch housing, respectively.

6. In a structure of the character described, a stub-pipe provided at its top and spaced from the forward end thereof with a flue pipe provided in its bottom with an opening opposite said flue pipe, a check damper carrying extension communicating with said opening and inclined forwardly and downwardly therefrom terminating in a downwardly and outwardly inclined marginal portion below the front of said stubpipe, a door frame having a circular portion secured to the marginal edges of said stub-pipe and a rectangular shaped forwardly and downwardly inclined frame section secured to the front end of said extension, a check damper door secured to said frame and normally closing the opening of said extension, and a horizontally swinging clean-out door adapted to open and close said stub-pipe.

In testimony whereof I have aflixed my signature.

ARTHUR H, ROBINSON, 

